How are you using your D600?

Paperweight.  I haven't had the chance to shoot with it yet. 

I will be using it for portraits and fashion using the following lenses:

Nikon 50mm f/1.4G

Nikon 70-300mm VR

Tamron 24-70mm f/2.8 VC

Usually f/1.8 - f/4.5 depending on the lens.

I shoot RAW and PP in CNX2.

Scott